Double-weight signature pattern codes for multicore-fiber code-division multiple-access networks

To transmit digitized image pixels in optical code-division multiple-access (CDMA) networks with multicore fiber, classes of two-dimensional (2-D) pat terns, so-called optical orthogonal signature pattern codes (OOSPC's), have recently been proposed. The new technology enables parallel transmission a nd simultaneous access of multiple 2-D images in multiple-access environmen ts, In this letter, we construct two new families of "double-weight" OOSPC' s without the assumption of identical weight for all signature patterns in a code set. Since the performance of a signature pattern varies with its we ight, these new double-weight OOSPC's are especially useful for optical CDM A networks with multiple performance requirements.